Listbox Renderer"
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Revision as of 08:17, 11 January 2022
Here we describe how to implement a custom renderer for a listbox (ListitemRenderer). For the concepts about component, model and renderer, please refer to the Model-driven Display section.
When a listbox (Listbox) is assigned with a model, a default renderer is assigned too. The default renderer will assume that each list item has only one column, and it converts the data into a string directly[1]. If you want to display multiple columns or retrieve a particular field of the data, you have to implement ListitemRenderer to handle the rendering.
For example,
public class MyRenderer implements ListitemRenderer{
public void render(Listitem listitem, Object data, int index) {
Listcell cell = new Listcell();
listitem.appendChild(cell);
if (data instanceof String[]){
cell.appendChild(new Label(((String[])data)[0].toString()));
} else if (data instanceof String){
cell.appendChild(new Label(data.toString()));
} else {
cell.appendChild(new Label("UNKNOW:"+data.toString()));
}
}
}
- ↑ If the listbox is assigned a template called model, then the template will be used to render the listbox. For more information, please refer to the Listbox Template section.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | February 2012 | The index argument was introduced. |